[Insight-users] Substract two Deformation fields(vectors) in itk

[Karthik Krishnan]

Hi Teo,

The MeanImageFilter, SubtractImageFilter, AddImageFilter etc should work 
fine for Images of vectors such as
Image< Vector< T, N >, ND > or Image< VariableLengthVector< T >, ND >
since these pixels overload the +, - and = operators.

The ones for variance or the StatisticsImageFilter, or the 
MinimumImageFilter etc probably won't work for these images cause the 
pixels don't define the operator*(Self) or the operator<

I guess if you want the equivalent of the StatisticsImageFilter that 
computes all the statistics on vector fields in one iteration through 
the image, you want to write your own custom filter.. I would think it 
should for the most part be a copy of the itk::StatisticsImageFilter.

What do you think ?

-karthik

Popa Teo wrote:

> Hi,
>  
> I have a ground truth deformation field.
> I deform an image based on this deformation field.
> Then I'm using demons registration to recover deformation field.
>  
> My question :Is in itk a filter that performs vector fields 
> substraction,the computation of the normal of this and then 
> calculation of mean,std,max,min so I can quantify what is the 
> difference between two fields?
>  
> Teo
>
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